JPS63179806A - Herbicide composition - Google Patents

Abstract

PURPOSE:To obtain a herbicide composition showing excellent herbicidal activity against a wide range of weeds with a small amount of synergistic effects, having no difference in activity in period for use and high safety to paddy rice plants, comprising a substituted phenoxyurea and a specific compound as active ingredients. CONSTITUTION:A herbicide composition comprising a substituted phenoxyurea such as 3-(3,5-dichlorophenoxy)-1,1-tetramethyleneurea, etc., shown by formula I (X is lower alkyl; n is 0-2; m is 4-6) well-known as an active ingredient for a herbicide having excellent effects on Echinochloa crus-galli Beauv. var. praticola Ohwi., annual broad-leaved weeds, etc., and methyl 2-[(4,6- dimethoxypyrimidin-2-yl)carbamoylsulfamoylmethyl]benzoate shown by formula II well-known as an active ingredient for a herbicice having excellent effects on perennial weeds such as arrow head, water nutgrass. The blending ratio of the compound shown by formula I and the compound shown by formula II is 1:0.01-1 by weight. The composition shows excellent herbicidal effects especially on weeds in paddy fields.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a herbicidal composition, particularly to a herbicidal composition having excellent herbicidal activity against paddy weeds.

[Conventional technology]

Herbicides for paddy fields in Japan are roughly divided into three categories, early, middle, and late herbicides, based on the timing of use, and the reality is that they are used in systematic treatment by combining these herbicides. Conventionally, as a herbicide, a substituted compound represented by the following general formula (1) (wherein, X represents a lower alkyl group, n represents an integer of ○ to 2, and m represents an integer of 4 to 6) A compound containing phenoxyurea (hereinafter referred to as compound (A)) as an active ingredient is known (Japanese Patent Laid-Open No. 61-126
No. 065). Another herbicide is methyl 2-((4
,6-dimethoxypyrimidin-2-yl)carbamoylsulfamoylmethyl]benzoate (hereinafter referred to as compound (
A product containing B) as an active ingredient is known (Japanese Patent Application Laid-open No. 112379/1983).

[Problem that the invention seeks to solve]

In recent years, for the purpose of saving agricultural work and preserving the environment, the absolute amount of herbicides sprayed on rice fields has been reduced, making it possible to control all weeds, including perennial weeds, with a single treatment, and to reduce the appropriate application period. There is a strong desire for a herbicide that is safe for paddy rice to emerge.

However, although the compound (A) has a remarkable effect on wild grasses, annual broad-leaved weeds, firefly, etc., it has a problem in that it is less effective against perennial weeds such as lilycystis vulgare, omodaka, and water hyacinth. In addition, compound (B) has a remarkable effect on perennials such as Prunus japonicus, Omodaka, and Cyperus spp., but there is a problem in that it shows almost no effect on Novie, a weed of the grass family. Therefore, the compounds (A), (B
) are not always fully satisfactory in herbicidal activity when used alone.

The present invention is intended to solve the problems mentioned in 2. By using the above compound (A) and compound (B) in combination,
To provide a herbicide composition that has a synergistic effect, can be used at any time from the onset of weed emergence to the growing season, has an accurate herbicidal effect on a wide range of weeds, and is safe for action. The purpose is to

[Means for solving problems]

The present invention provides a substituted phenoxyurea represented by the general formula [I] (wherein, X represents a lower alkyl group, n represents an integer of O to 2, and m represents an integer of 4 to 6); This herbicide composition contains methyl 2-((4,6-dimethoxypyrimidin-2-yl)carbamoylsulfamoylmethyl]benzoate as an active ingredient.

Compound (A) which is one component of the herbicide composition of the present invention
is a substituted phenoxyurea represented by the above general formula (1). In general formula (I), the lower alkyl group represented by X is substituted at any position of the hydrocarbon group represented by (C, H2, -n). There are various compounds (A) represented by the general formula (1), and these are 1
More than one species can be used.

Representative examples of the substituted phenoxyurea contained in compound (A) are as described below.

Compound (A1) 3-(3,5-dichlorophenoxy)-1,]-tetramethyleneurea compound (A2) 3-(3,5-dichlorophenoxy)-1,1-pentamethyleneurea compound (A3) 3- (3,5-dichlorophenoxy)-1,1-(1-
methyl)-pentamethylene urea compound (A4) 3-(3,5-dichlorophenoxy)-1,1-(1-
ethyl)-pentamethylene urea compound (A5) 3-(3,5-dichlorophenoxy)-1,1-(2,
4-dimethyl)-pentamethylene urea compound (A6) 3-(3,5-dichlorophenoxy)-1,1-hexamethylene urea Methyl 2 which is the compound (B) of the other component of the herbicidal composition of the present invention - ((4,6-cymethoxypyrimidine-2
-yl)carbamoylsulfamoylmethyl]benzoate is a compound represented by the following formula (I[).

The compound (^) and compound (B) in the present invention are blended in a weight ratio of 0.01 to 1 part of compound (B) to 1 part of one or more compounds (A). It is appropriate to do so. The herbicidal composition of the present invention may contain other active ingredients in addition to the above two components. 1゜The herbicidal composition of the present invention may contain a carrier, a surfactant, a dispersant, an adjuvant in addition to the above-mentioned active ingredients. It is preferable to formulate and apply the preparations into, for example, granules, aqueous preparations, emulsions, fine granules, powders, etc., by a conventional method. Suitable carriers include, for example, talc, bentonite, clay, kaolin, diatomaceous earth, white carbon, vermiculite, slaked lime, silica sand, ammonium sulfate, solid carriers such as urea, isopropyl alcohol,
Examples include liquid carriers such as xylene and cyclohexanone. Examples of surfactants and dispersants include alcohol sulfate salts, alkyl sulfonate salts, lignin sulfonate salts, polyoxyethylene glycol ethers, polyoxyethylene alkylaryl ethers, and polyoxyethylene sorbitan monoalkylates. . Examples of the adjuvant include carboxymethylcellulose, polyethylene glycol, gum arabic, and the like.

The herbicidal composition of the present invention is prepared by diluting the above-mentioned preparation to an appropriate concentration and spraying it, or by applying it directly.

Furthermore, the herbicide composition of the present invention may optionally contain an insecticide,
Mixed use with fungicides or other herbicides and mixed formulations are also possible.

The herbicide composition of the present invention exhibits excellent herbicidal activity against paddy field weeds and is suitable as a herbicide for paddy fields, but it can also be used as a herbicide for other agricultural and horticultural purposes.

The herbicide composition of the present invention complements and exhibits a complete control effect on weeds that are difficult to control with a single agent, and also exhibits a synergistic herbicide effect even at low doses that cannot completely control weeds. It exerts a remarkable control effect not only on weeds but also on perennial weeds, which have been occurring frequently in recent years, over a long period of time, from the weed onset period immediately after rice planting to the growing season. For example, grasshoppers, other annual broad-leaved weeds, bulrushes, and other annual broad-leaved weeds that grow in rice fields.
It is possible to control annual and perennial weeds such as weeds such as Prunus japonicum, Cyperus japonica, Prunus spp., Prunus spp. Furthermore, the herbicidal composition of the present invention is highly safe for crops such as paddy rice, and is a herbicidal composition that meets the needs of early- to mid-season treatment agents, which have been particularly required in recent years.

〔Effect of the invention〕

As described above, according to the present invention, compounds (A) and (B
), a synergistic effect can be obtained by using it in combination, which shows high herbicidal activity against a wide range of weeds with a low dosage, and can be used at any time from the beginning of weed emergence to the growing season, and is highly safe. There are effects such as

〔Example〕

Examples of the herbicidal composition of the present invention will be given next, but the present invention is not limited thereto. In the Examples, all parts are by weight.

Example 1 3 parts of compound (A4), 0.3 parts of compound (B), 30 parts of bentonite, 58.7 parts of calcium carbonate, 3 parts of sodium tripolyphosphate, 3 parts of sodium lignin sulfonate, sodium salt of lauryl alcohol sulfate ester Mix and grind the two parts uniformly. 15 parts of water are added to 100 parts of this mixture, the mixture is kneaded and granulated using a 0.8 mm extrusion type granulator. After drying, the mixture is sieved through 14 to 32 meshes to form granules.

Example 2 3 parts of compound (A6), 0.3 parts of compound (B), 30 parts of bentonite, 58.7 parts of calcium carbonate, 3 parts of sodium tripolyphosphate, 3 parts of sodium lignin sulfonate, sodium salt of lauryl alcohol sulfate ester Mix and grind the two parts uniformly. Add 15 parts of water to 100 parts of this mixture, knead it, granulate it with a 0.8 mm extrusion type granulator, and after drying,
Sift through 4 to 32 meshes to form granules.

Example 3 4 parts of compound (A4), 0.1 part of compound (B), 15 parts of bentonite, 67.9 parts of talc, 10 parts of carboxymethylcellulose, and 3 parts of sodium ligninsulfonate are uniformly mixed and ground. 18 parts of water was added to 100 parts of this mixture, kneaded, and granulated using a 0.8 mm extrusion type granulator.

After drying, sieve through 14 to 32 meshes to form granules.

Example 4 3 parts of compound (A6), 0.1 part of compound (B), 35 parts of bentonite, 53.9 parts of talc, 3 parts of carboxymethyl cellulose, 3 parts of sodium lignin sulfonate, 2 parts of sodium salt of lauryl alcohol sulfate Mix and grind evenly. Add 18 parts of water to 100 parts of this mixture, knead it, granulate it with a 0.81 extrusion type granulator, and after drying,
Sieve through 32 mesh to make granules.

Example 5 30 parts of bentonite, 62 parts of calcium carbonate, 3 parts of sodium tripolyphosphate, 3 parts of sodium lignin sulfonate, and 2 parts of soda salt of lauryl alcohol sulfate are uniformly mixed and pulverized. 15 parts of water are added to 100 parts of this mixture, the mixture is kneaded and granulated using a 0.8 mm extrusion type granulator. After drying, the mixture is sieved through 14 to 32 meshes to obtain an adsorption base.

To 90 parts of this base, 40 parts of compound (A4), compound (B
), 20 parts of acetone, and 36 parts of polyethylene glycol were mixed and dissolved, and 10 parts of the mixture was uniformly adsorbed to form granules.

Example 6 10 parts of compound (A6), part of compound (B), clay 8
5 parts of sodium dinaphthylmethane disulfonate, 2 parts of sodium dinaphthylmethane disulfonate, and 2 parts of sodium ligninsulfonate are uniformly mixed and pulverized to obtain a wettable powder.

Next, the effects of the herbicide composition of the present invention will be explained with reference to test examples.

Test Example 1 A 1/1500 a vat is filled with paddy soil, and after being flooded and plowed, the vat is flooded. Seeds of Novie and Hotarui were sown in this, and tubers of Urikawa, Mizugayatsu, and Omodaka were transplanted, and 3 plants per pot were transplanted to a depth of 3 cm using 2 paddy rice seedlings (2.5 leaves) each. The plants were grown in a greenhouse while keeping the water source 3 cm deep.

4 days after transplanting (weed emergence surface) and 18 days after transplanting (nobies 3~
At the 3.5 leaf stage), a predetermined amount of the granules prepared according to Example 1 was applied. After treatment, water leakage of 2 cm per day was allowed.

One month after chemical treatment, we investigated the herbicidal effect and chemical damage.
The results of the treatment 4 days after transplantation are shown in Table 1, and the results of the treatment 18 days after transplantation are shown in Table 2.

In each table, the herbicidal effects and phytotoxicity of each grass species were expressed using 11-level numerical values from (0) to (5) according to the following evaluation criteria.

Evaluation Criteria = 14- Test Example 2 After plowing, fertilizing, watering, and puddling in a paddy field where common weeds naturally occur, paddy rice seedlings (variety: Harare) at the 2.2 to 2.5 leaf stage were transplanted. . After transplanting, add 3 to 5 c of rice water
During the weed emergence period (3 days after transplanting) while maintaining the waterlogging condition at m.
Then, the granules prepared according to Example 1 were treated at the 3rd to 3.5th leaf stage of wildflowers (18 days after transplantation). The test was conducted in two consecutive 4-hour races in the 1st section. One month after the chemical treatment, the herbicidal effect and chemical damage to paddy rice were investigated according to the standards of Test Example 1. The results of the treatment 3 days after transplantation are shown in Table 3, and the results of the treatment 18 days after transplantation are shown in Table 4.
Shown in the table.

From the above results, it can be seen that the herbicidal composition of the present invention has a synergistic effect, has high herbicidal activity against a wide range of weeds, has no difference in activity depending on the time of use, and is highly safe for paddy rice.

Claims (3)

[Claims] (1) General formula [I] ▲Mathematical formulas, chemical formulas, tables, etc.▼...[I] (In the formula, X represents a lower alkyl group, n represents an integer from 0 to 2, and m represents 4 to 2. A herbicidal composition containing a substituted phenoxyurea represented by the following integer 6) and methyl 2-[(4,6-dimethoxypyrimidin-2-yl)carbamoylsulfamoylmethyl]benzoate as active ingredients. (2) Substituted phenoxyurea of general formula [I] is 3-(3
,5-dichlorophenoxy)-1,1-tetramethyleneurea, 3-(3,5-dichlorophenoxy)-1,1-
Pentamethylene urea, 3-(3,5-dichlorophenoxy)-1,1-(1-methyl)-pentamethylene urea,
3-(3,5-dichlorophenoxy)-1,1-(1-
ethyl)-pentamethyleneurea, 3-(3,5-dichlorophenoxy)-1,1-(2,4-dimethyl)-pentamethyleneurea, and 3-(3,5-dichlorophenoxy)-1,1- The herbicidal composition according to claim 1, which is one or more selected from hexamethylene urea. (3) The blending ratio of substituted phenoxyurea of general formula [I] and methyl 2-[(4,6-dimethoxypyrimidin-2-yl)carbamoylsulfamoylmethyl]benzoate is 1:0.01 to 1:0.01 by weight. 1 part of the herbicidal composition according to claim 1 or 2.